MARTIN SPROCKET & GEAR INC 50BS20HT 1

Marsoni

M251S

$84.00

Get it in 3 business days with 1 day shipping. Friday, May 29

MARTIN SPROCKET & GEAR INC 50BS20HT 150BS20HT1SPROCKET20 TEETH1 IN BORE DIAMETER4. 321 IN OUTSIDE DIAMETER50 5 8 IN CHAIN AND PITCH1 HUB3. 9953 IN PITCH DIAMETER3. 5953 IN CALIPER DIAMETER0. 3430 IN TOOTH WIDTH1 4 X 1 8 IN KEYWAY

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Similar criticism to my review of the Black Holes book: "Starts off ok, but quickly loses you. I have an extensive science education and quickly got lost. This topic cannot be easily explained in a brief book - the author is forced to jump over certain building blocks, and that just leaves the reader confused. I think this book series is good, but maybe not for abstract science topics."

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Reviewed in the United States on February 11, 2026

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Rusty.

Battle Creek, US

★★★★★ 5

A fun read. Learned a lot.

Format: Kindle

I never expected to be able to understand Relativity or the more ethereal concepts of time. But Jenann brought them to my level. The language gets a bit flowery at times but I think that reflects that these ideas have a poetry of their own. RL

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Reviewed in the United States on July 10, 2023

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Kindle Customer

Whiting, US

★★★★★ 5

Clear, Concise, and Compelling

Format: Kindle

The author takes us in an extraordinary trip through and about time. In particular, the discussion about Einstein’s Special and General Theories of Relativity were illuminating, clarifying a complex aspect of the nature of the universe. How should we think about time? This book will help the reader arrive at answers to that question.

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Reviewed in the United States on November 30, 2021

Louisville, US

★★★★★ 5

Deep important and illuminating

Format: Kindle

Worth a second read. I keep going back to it.

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Reviewed in the United States on July 2, 2023