Pulp Parade #236: Early microwave technology was not very safe

This is The Spider from December 1940, I found this image (in principle, the link might be partly broken) from this Hiveminer page.

Pulp Parade #235: Early A.S.F.R. pirates

This is The Spider for August 1940, cover by Rafael DeSoto. I found this version of the cover at this bondage index.

This is The Spider for June 1940. I found this version of the cover (along with a brief article about The Spider) at ThePulp.net.

This is The Spider for May, 1940, cover by Rafael DeSoto. I found this version of the cover at Pulpcovers.com.

This is The Spider for April, 1940. I found this version of the cover in this bondage index.

This is The Spider for January 1940. I found this version of the cover in this bondage index.

This is The Spider for November 1939, cover by Rafael DeSoto. I found this version of the cover at Pulpcovers.com.

This is The Spider for October 1939. I found this version of the cover at this bondage index.

This yellow peril cover is from The Spider, September 1939 and was done by John Newton Howitt. I found it at Pulpcovers.com.

This is The Spider for June 1939. I found this version of the cover via the index at Galactic Central.