Alcatraz Escape — Part 8

106 pages · May 08, 2026 · Document date: Jun 25, 1962 · Broad topic: Prisons & Escapes · Topic: Alcatraz Escape · 105 pages OCR'd

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Specimen Q18 has a base of concrete composed of Portland cement and sand. Over the concrete is a layer of white coment paint similar to the K2 white cement paint. Specimen Q19 is basically a mixture of Portland cement, sand grains and white cement paint with a layer. of white cement paint over the mixture. Specimen Q21 is similar to Q19 in that it is basically a mixture of Portland cement and white cement paint over which is white cement paint. ; Specimen Q20 is formed from soap packed over a small bundle of white cotton rags. Although the tan or flesh-colored paint on the dummy faces was basically similar to the K7 paint, differences were noted. It appears that paint like K7 could have been used on the dummy faces; however, prior to use other paint ingredients were added to it. For example the paint on Q20 and Q21 contained barium not found in the K7 paint, and the paint on Q18 and Q19 contained more lead than the K7 paint. Paint ingredients, pigments or extenders containing barium or lead could have been added to K7 and then the mixture could rane have been applied to the dumny faces. The two paddles, Q24 and Q25, are similar in design and construction and are composed of similar materials. The blue-green paint used on the cells, specimen Kl (FBI Laboratory report dated July 3) was similar in color and composition to the blue-green paint on Q24 and Q26. The walls or sides of the periscope, Q23, and the backing on Q26 wre composed of a material similar to an artist panel which is a white cotton canvas over a stiff cardboard backing. This panellike: material present in the periscope, Q23, bears the trade name "Blue Boy" and "18" X 24". The adhesive on the inside of the periscope is similar to Rem-Weld liquid plastic adhesive as found in specimen Q22. 7 All of the submitted saw blades in specimens Q8, Q10O and Q13 appear to be homemade. The following information was | compiled concerning the saw blades: . APPROXIMATE NUMBER SPECIMEN LENGTH WIDTH THICKNESS OF TEETH PER INCH i Qs 61/8" 11/16" 90.013" 14 - Page 3 (continued on next page) PC-70654 GH 15 Pog i eee

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Specimen Q18 has a base of concrete composed of
Portland cement and sand. Over the concrete is a layer of
white coment paint similar to the K2 white cement paint.

Specimen Q19 is basically a mixture of Portland
cement, sand grains and white cement paint with a layer. of
white cement paint over the mixture.

Specimen Q21 is similar to Q19 in that it is
basically a mixture of Portland cement and white cement paint
over which is white cement paint.

; Specimen Q20 is formed from soap packed over a
small bundle of white cotton rags.

Although the tan or flesh-colored paint on the
dummy faces was basically similar to the K7 paint, differences
were noted. It appears that paint like K7 could have been
used on the dummy faces; however, prior to use other paint
ingredients were added to it. For example the paint on Q20
and Q21 contained barium not found in the K7 paint, and the
paint on Q18 and Q19 contained more lead than the K7 paint.
Paint ingredients, pigments or extenders containing barium
or lead could have been added to K7 and then the mixture could
rane have been applied to the dumny faces.

The two paddles, Q24 and Q25, are similar in design
and construction and are composed of similar materials.

The blue-green paint used on the cells, specimen Kl
(FBI Laboratory report dated July 3) was similar in color and
composition to the blue-green paint on Q24 and Q26.

The walls or sides of the periscope, Q23, and the
backing on Q26 wre composed of a material similar to an artist
panel which is a white cotton canvas over a stiff cardboard
backing. This panellike: material present in the periscope,
Q23, bears the trade name "Blue Boy" and "18" X 24". The
adhesive on the inside of the periscope is similar to Rem-Weld
liquid plastic adhesive as found in specimen Q22. 7

All of the submitted saw blades in specimens Q8, Q10O
and Q13 appear to be homemade. The following information was |
compiled concerning the saw blades: .

APPROXIMATE NUMBER
SPECIMEN LENGTH WIDTH THICKNESS OF TEETH PER INCH

i
Qs 61/8" 11/16" 90.013" 14
- Page 3 (continued on next page)
PC-70654 GH 15

Pog
i

eee