A vein from the leg is removed and grafted to the coronary artery to bypass a blockage. Coronary artery bypass surgery during mobilization (freeing) of the right coronary artery from its surrounding tissue, adipose tissue (yellow). The tube visible at the bottom is the aortic cannula (returns blood from the HLM).
The average yearly income in 1930 was $1,368. With a 40 hour work  week that is an average of about 65 cents per hour.1368 per annum. Keep in mind two things: there were almost no taxes back then, and unimployment was high, so this is an average of the mostly white collar workforce.
In 1930 the average wage for a timework labourer in the engineering field was just under a shilling per hour; it dipped in 1933-4, then climbed again to around 1s 2d by 1938. In some cases, wage cuts were more severe. Public sector pay cuts announced in 1931 reduced wages by 10 to 20%.